Simplify using helper methods in components

The `use_helpers` method was added in ViewComponent 3.8.0, and it's
included by default in all components since version 3.11.0.

Note we sometimes delegated the `can?` method to the controller instead
of the helpers, for no particularly reason. We're unifying that code as
well.

app/components/admin/settings/text_form_component.rb

@@ -1,6 +1,6 @@
 class Admin::Settings::TextFormComponent < ApplicationComponent
   attr_reader :setting, :tab
-  delegate :dom_id, to: :helpers
+  use_helpers :dom_id
 
   def initialize(setting, tab: nil)
     @setting = setting